Check Electrical Connections; Check The Mixing Valve For Obstructions And Leaks - Viessmann Vitocrossal 300 Service Manual

Vitocrossal 300 CU3A 26 to 57 Service

Check Electrical Connections

Check Gas Pipes and Fittings for Leaks
Checking the Mixing Valve for Obstructions and Leaks
Ensure all plug-in connectors and strain reliefs make
positive contact and are seated properly.
Refer to the Installation Instructions
Note: For the tightness test, use only suitable and
approved leak detecting agents and devices.
Leak detecting agents with unsuitable contents
(e.g. nitrites, sulphides) can lead to material
damage. Remove residues of the leak detecting
agent after testing.
WARNING
Escaping gas leads to a risk of explosion.
Check gas equipment for tightness.
WARNING
The gas supply piping must be leak tested before placing
the boiler in operation.
CAUTION
Ensure all joints of gas line are pressure tight and that
gas valves do not leak when under normal operating
pressure (use approved leak detection liquid).
1. Remove the motorized lever from the mixing valve
handle.
2. Check the mixing valve for ease of operation.
3. Check the mixing valve for leaks. Replace the O-rings
if the mixing valve leaks.
4. Snap the motorized lever into place.
Service
27